A correlation coefficient measures the association between two methods.
The correlation coefficient is sometimes re-purposed as an adequate range test (CLSI, 2002) on the basis that the ratio of variation between subjects, relative to measurement variation, is an indicator of the quality of the data (Stöckl & Thienpont, 1998). When the correlation coefficient is greater than 0.975 the parameters of an ordinary linear regression are not significantly biased by the error in the X variable, and so linear regression is sometimes recommended.
However, with the wide range of proper regression procedures available for analyzing method comparison studies, there is little need to use inappropriate models.
We've been developing intuitive high-quality statistical software at an affordable price, backed up by fast friendly customer service for over 25 years...
Office hours: 9am-5pm GMT Mon-Fri
It's Tuesday 5:02 PM and the office is closed - e-mail us and we'll get back to you as soon as possible.